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Diffstat (limited to '')
| -rw-r--r-- | c/src/lib/librdbg/i386/excep_f.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/c/src/lib/librdbg/i386/excep_f.c b/c/src/lib/librdbg/i386/excep_f.c new file mode 100644 index 0000000000..100b0d79d6 --- /dev/null +++ b/c/src/lib/librdbg/i386/excep_f.c @@ -0,0 +1,153 @@ +/* + ************************************************************************** + * + * Component = + * + * Synopsis = rdbg/i386/excep.c + * + * $Id$ + * + ************************************************************************** + */ + +#include <rtems.h> +#include <rtems/error.h> +#include <assert.h> +#include <errno.h> +#include <rdbg/rdbg.h> +#include <rdbg/servrpc.h> + +/* ----------------------------------------------------------------- + Maping of hardware exceptions into Unix-like signal numbers. + It is identical to the one used by the PM and the AM. + ----------------------------------------------------------------- */ + + int +ExcepToSig (Exception_context *ctx) +{ + int excep = getExcNum (ctx); + + + switch (excep) { + + case I386_EXCEPTION_MATH_COPROC_UNAVAIL: + case I386_EXCEPTION_I386_COPROC_SEG_ERR: + case I386_EXCEPTION_FLOAT_ERROR: + case I386_EXCEPTION_BOUND: + return SIGFPE; + + case I386_EXCEPTION_DEBUG: + case I386_EXCEPTION_BREAKPOINT: + case I386_EXCEPTION_ENTER_RDBG: + return SIGTRAP; + + case I386_EXCEPTION_OVERFLOW: + case I386_EXCEPTION_DIVIDE_BY_ZERO: + case I386_EXCEPTION_ILLEGAL_INSTR: + return SIGILL; + + case I386_EXCEPTION_SEGMENT_NOT_PRESENT: + case I386_EXCEPTION_STACK_SEGMENT_FAULT: + case I386_EXCEPTION_GENERAL_PROT_ERR: + case I386_EXCEPTION_PAGE_FAULT: + return SIGSEGV; + + default: + break; + } + return SIGKILL; +} + + +/*----- Breakpoint Exception management -----*/ + + /* + * Handler for Breakpoint Exceptions : + * software breakpoints. + */ + +void +BreakPointExcHdl(CPU_Exception_frame *ctx) +{ + rtems_status_code status; + rtems_id continueSemId; + + if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) { + PushSavedExceptCtx (_Thread_Executing->Object.id, ctx); + justSaveContext = 0; + } + else { + if (ctx->idtIndex != I386_EXCEPTION_DEBUG){ + NbSerializedCtx++; + rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); + NbSerializedCtx--; + } + + currentTargetThread = _Thread_Executing->Object.id; + +#ifdef DDEBUG + printk("----------------------------------------------------------\n"); + printk("Exception %d caught at PC %x by thread %d\n", + ctx->idtIndex, + ctx->eip, + _Thread_Executing->Object.id); + printk("----------------------------------------------------------\n"); + printk("Processor execution context at time of the fault was :\n"); + printk("----------------------------------------------------------\n"); + printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n", + ctx->eax, ctx->ebx, ctx->ecx, ctx->edx); + printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n", + ctx->esi, ctx->edi, ctx->ebp, ctx->esp0); + printk("----------------------------------------------------------\n"); + printk("Error code pushed by processor itself (if not 0) = %x\n", + ctx->faultCode); + printk("----------------------------------------------------------\n\n"); +#endif + + status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'), + 0, + RTEMS_FIFO | + RTEMS_COUNTING_SEMAPHORE | + RTEMS_NO_INHERIT_PRIORITY | + RTEMS_NO_PRIORITY_CEILING | + RTEMS_LOCAL, + 0, + &continueSemId); + if (status != RTEMS_SUCCESSFUL) + rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status)); + + PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx); + + switch (ctx->idtIndex){ + case I386_EXCEPTION_DEBUG: + DPRINTF((" DEBUG EXCEPTION !!!\n")); + ctx->eflags &= ~EFLAGS_TF; + ExitForSingleStep-- ; + rtems_semaphore_release( wakeupEventSemId ); + break; + + case I386_EXCEPTION_BREAKPOINT: + DPRINTF((" BREAKPOINT EXCEPTION !!!\n")); + rtems_semaphore_release( wakeupEventSemId ); + break; + + case I386_EXCEPTION_ENTER_RDBG: + DPRINTF((" ENTER RDBG !!!\n")); + rtems_semaphore_release( wakeupEventSemId ); + break; + + default: + DPRINTF((" OTHER EXCEPTION !!!\n")); + rtems_semaphore_release( wakeupEventSemId ); + break; + } + + rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); + + PopExceptCtx (_Thread_Executing->Object.id); + rtems_semaphore_delete(continueSemId); + } +} + + + |